オートラジオグラフ法による金属間拡散の測定法
1959 年 28 巻 7 号 p. 426-432
詳細
1959 年 28 巻 7 号 p. 426-432
A method of measuring the metallic diffusion is established by using an autoradiograph. Several difficulties encountered in using this method are overcome by contemplating that:
1) Effect of γ-rays is negligible for specimens of less than 0.2mm in thickness.
2) Photographic density on nuclear plate is proportional to diffusing atoms so long as the density is below 1.0. In this experiment, however, the density is limited not to exceed 0.5_??_0.7 (plate density inclusive) for obtaining better results.
3) For measuring photographic density by micro-photometer, the width of the slit should be set according to the penetration depth. For example, should the allowable error be 5%, the slit width would be 100μ for 1.3mm, 10μ for 0.7 mm and 5μ for 0.4mm etc. of the penetration depth.
By the above method, the diffusion coefficients of a f. f. c. single crystal are determined with accuracy better than by any other method. Furthermore, anisotropy of diffusion is observed.
